Based on what you have written it sounds like everything is 120 VAC. Most 120 VAC circuits/components will have 2 (black/white) or 3 (black/white/green). Black is the hot wire/white is neutral/green is ground (3 prong plugs).
For 120 VAC circuits connect all the black wires together with a wire...
I have an automatic door and waterer. I have a friend that loves poultry and is more than happy to tend my flock when my wife and I are away. I pay a little cash and let him keep the eggs, which he gives to his friends and neighbors and I end up with more customers for my eggs.
Sorry to hear about your problem. Have you been seeing hawks flying about. We had 5 hawks swarming above for the kill. I ended up locking up the hens and putting a net over the entire chicken yard. Solved the problem, but not before I lost 12 hens. The injured one, I would probably cull and try...